| Also known as | WW10037 |
| Diagram | Fig. 6 — TIMING COVER AND CONTACT BREAKER · ref 26 |
| Subsystem | engine bottom |
| Listed in parts books | 1966 |
CONTACT BREAKER, ‘type 4CA
Lucas type 4CA contact breaker assembly for the timing cover, the points unit that triggers ignition timing.
This is the Lucas 4CA contact breaker assembly, the points unit that sits under the timing cover on these engines and handles ignition timing duty. It's the part that opens and closes to trigger the spark at the right moment, and it's the thing you check and gap whenever the bike starts running rough or won't fire up reliably.
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Our catalog shows this one appearing under the TIMING COVER AND CONTACT BREAKER figure, with catalog coverage centered on 1966. It also carries the older WW10037 reference in case that's the number printed in your parts book.
Contact breaker units wear at the heel of the follower and the contact faces over time, so if your engine's been running a while it's worth pulling the cover and having a look before you assume the points are still good.
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